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Period is a Type that represents a time interval, that also includes DayCount and DateBump conventions.
It may be referred through a handle name or created by a text entry having the syntax:
s{h|b}, where s = Step, h = Holiday, b = DateBump.
Note case and spaces are ignored.
For example: 2m{NYK|mf}.
Also several single periods may be added to form a sequence.
For example: 2m{NYK|mf}3d{nyk|f}